How to save index of Values of an item in a matrix?

I have a matrix of of elements like

[0,0,0,1,0,0,0,0,1,0,1]

I'd like to go through the matrix and at each element where the value is greater than zero, I want to save the index to a new matrix such that the new matrix looks like:

[4, 9, 11]

Answer 1

[Dyuman Joshi]

x=[0,0,0,1,0,0,0,0,1,0,1];
y=find(x>0)

y = 1×3

4 9 11